GitHub user sukisevensuki-jpg added a comment to the discussion: Question: 
Encountered "Failed to save slice" error when saving chart to dashboard

Hi @dosu,

**Current Status:**
1. ✅ **Save as New Chart**: Works perfectly. The user can create and save new 
charts without issues.
2. ❌ **Save (Overwrite/Update)**: Fails with "Failed to save slice" when trying 
to update an existing chart.
3. 👤 **Ownership**: I verified that the user **IS** the owner of the chart they 
are trying to update.
4. 🔧 **Permissions Added**: I explicitly added `can read on Dataset` and `can 
read on Database` to their roles (`Gamma` + `sql_lab` + `WAREHOUSE_RW`), but 
the overwrite issue persists.

GitHub link: 
https://github.com/apache/superset/discussions/38618#discussioncomment-16111820

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